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          简单工厂模式
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              <time title="创建时间：2020-03-09 16:46:40 / 修改时间：16:46:41" itemprop="dateCreated datePublished" datetime="2020-03-09T16:46:40+08:00">2020-03-09</time>
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        <p>简单工厂模式又叫静态工厂方法，由一个工厂对象决定创建某一种产品对象类的实例。主要用来创建同一类对象</p>
<a id="more"></a>
<h1 id="简单工厂"><a href="#简单工厂" class="headerlink" title="简单工厂"></a>简单工厂</h1><p>在创建了很多类的时候，将所有的类封装在一个函数里。别人在调用时，只需要记住这一个函数就行。这个函数也被称为工厂函数，这种模式叫简单工厂模式，也是工厂模式中最简单的一种。</p>
<h2 id="创建简单工厂"><a href="#创建简单工厂" class="headerlink" title="创建简单工厂"></a>创建简单工厂</h2><p>简单工厂模式的理念就是创建对象，</p>
<h3 id="对不同的类进行实例化方式"><a href="#对不同的类进行实例化方式" class="headerlink" title="对不同的类进行实例化方式"></a>对不同的类进行实例化方式</h3><p>假如创建了很多个类，别人在使用时，还需要去找到相对应的类，这样太麻烦了。所以将这些所有的类封装在一个函数里，故只需要记住这一个函数名就可以了。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//篮球基类</span></span><br><span class="line"><span class="keyword">let</span> Basketball=<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.intro=<span class="string">"篮球"</span>;</span><br><span class="line">&#125;</span><br><span class="line">Basketball.prototype=&#123;</span><br><span class="line">    getMember:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">"5"</span>);</span><br><span class="line">    &#125;,</span><br><span class="line">    getBallSize:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">"big"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//足球基类</span></span><br><span class="line"><span class="keyword">let</span> Football=<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.intro=<span class="string">"足球"</span>;</span><br><span class="line">&#125;</span><br><span class="line">Football.prototype=&#123;</span><br><span class="line">    getMember:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">"11"</span>);</span><br><span class="line">    &#125;,</span><br><span class="line">    getBallSize:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">"medium"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//网球基类</span></span><br><span class="line"><span class="keyword">let</span> Tennis=<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.intro=<span class="string">"网球"</span>;</span><br><span class="line">&#125;</span><br><span class="line">Tennis.prototype=&#123;</span><br><span class="line">    getMember:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">"1"</span>);</span><br><span class="line">    &#125;,</span><br><span class="line">    getBallSize:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">"small"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//运动工厂</span></span><br><span class="line"><span class="keyword">let</span> SportsFactory=<span class="function"><span class="keyword">function</span>(<span class="params">type</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">switch</span>(type)&#123;</span><br><span class="line">        <span class="keyword">case</span> <span class="string">"NBA"</span>:</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">new</span> Basketball();</span><br><span class="line">        <span class="keyword">case</span> <span class="string">"worldCup"</span>:</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">new</span> Football();</span><br><span class="line">        <span class="keyword">case</span> <span class="string">"FrenchOpen"</span>:</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">new</span> Tennis();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> football=SportsFactory(<span class="string">"worldCup"</span>);</span><br><span class="line"><span class="built_in">console</span>.log(football);</span><br><span class="line"><span class="built_in">console</span>.log(football.intro);</span><br><span class="line">football.getMember();</span><br></pre></td></tr></table></figure>



<h3 id="创建相似对象"><a href="#创建相似对象" class="headerlink" title="创建相似对象"></a>创建相似对象</h3><p>当很多类有相同的地方时，可以抽象提取出来共用。比如说有一堆书，书名还有出版时间等是不一样的，这就需要针对性的处理。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">createBook</span>(<span class="params">name,time,type</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> o=<span class="keyword">new</span> <span class="built_in">Object</span>();</span><br><span class="line">    o.name=name;</span><br><span class="line">    o.time=time;</span><br><span class="line">    o.type=type;</span><br><span class="line">    o.getName=<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="keyword">this</span>.name);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> o;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//test</span></span><br><span class="line"><span class="keyword">let</span> book1=createBook(<span class="string">"JS"</span>,<span class="string">"2019"</span>,<span class="string">"js"</span>);</span><br><span class="line"><span class="keyword">let</span> book2=createBook(<span class="string">"CSS"</span>,<span class="string">"2019"</span>,<span class="string">"css"</span>);</span><br><span class="line">book1.getName();</span><br><span class="line">book2.getName();</span><br></pre></td></tr></table></figure>

<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>简单工厂有两种方法，一个是实例化对象创建的，第二种是通过创建一个新对象然后包装增强其属性和功能。</p>

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